var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var allowCORS = function(req, res, next) {
  res.header('Access-Control-Allow-Origin', req.headers.origin);
  res.header('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE,OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type');
  res.header('Access-Control-Allow-Credentials', 'true');

  next();
}

var registerRouter = require('./routes/register');
var loginRouter = require('./routes/login');
var indexRouter = require('./routes/index');
var userRouter = require('./routes/user');
var uploadRouter = require('./routes/upload')
var app = express();

// view engine setup
var ejs = require('ejs');
app.engine('html',ejs.__express);
app.set('view engine', 'html');
app.set('views', path.join(__dirname, 'views'));
 
// 使用跨域中间件
app.use(allowCORS);

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/register', registerRouter);
app.use('/login', loginRouter);
app.use('/index', indexRouter);
app.use('/user', userRouter);
app.use('/upload',uploadRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
